docs: def validate_uses_tls_for_glance(audit_options):
      """Verify that TLS is used to communicate with Glance."""
      section = _config_section(audit_options, 'glance')
      assert section is not None, "Missing section 'glance'"
      assert not section.get('insecure') and \
          "https://" in section.get("api_servers"), \
          "TLS is not used for Glance"